Hackaday Prize 2022: A Not-So-Smart Spot Welder

An exploded diagram of the spot welder. Shown are the capacitor bank, trigger, 12 V relay, DC power input, power out, step up converter, voltmeter, industrial SCR module, and capacitor bank.

Diy location welders generally use substantial-powered parts that can be a bit terrifying, presented the likely for dangerous malfunctions. [Wojciech “Adalbert” J.] built his capacitive discharge spot welder to be safe and sound, quick to construct, and forego the microcontroller.

Many initiatives work great with just a solitary Li-ion mobile, but when you require additional ability, you have bought to commence connecting extra cells alongside one another into a battery. [Wojciech]’s spot welder is made to be just powerful enough to weld nickel tabs onto a mobile without having any overkill. The capacitor financial institution makes use of nineteen Nichicon UBY 7500uF/35V capacitors, all wired in parallel working with solder wick saturated with solder. They sit atop on a perfboard with metallicized holes to carry the substantial latest.

[Wojciech] has comprehensive each stage of building the welder, which include improvements to the off-the-shelf relay board and including a potentiometer to the phase-up converter board. The stage of element would make this seem to be like a good beginning position if you are hoping to hop into the entire world of Do-it-yourself location welders. Safe and sound is usually a relative expression when dealing with superior powered gadgets, so be watchful if you do try this build!

Diy place welders have graced these digital pages numerous occasions, which include this one particular constructed with basic safety in brain, and this other a single that was decidedly not.

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